BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 111)

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5
Remote Interface Operations
1201 supports two remote interfaces: the built-in USB and optional GPIB
(IEEE-488). With GPIB, you will need a GPIB interface card. This chapter
lists the SCPI (Standard Commands for Programmable Instrument)
commands available to control the multimeter. For the first time to use
SCPI, users would better to refer to Appendix B. for SCPI reference.
5.1 Pass/Fail Output From USB Connector
The USB connector on the rear panel of 1201 is a series “B” connector.
When the USB interface is disabled (IEEE-488 interface is selected), the
internal pass and fail TTL output signals (limit testing) will be connected
to the USB connector.
The pass and fail signals are low true and indicate the Math Pass/Fail
Limit Test result for the next reading to be output to the GPIB interface.
The signals are active low for approximately 2ms (  100  sec) for each
reading taken. Figure 2-17 shows the USB connector (series “B”).
Figure 2-17
Contact Signal Name Typical Wiring Description